Source Mapper

What are source maps?
http://www.html5rocks.com/en/tutorials/developertools/sourcemaps
Why
This works well in conjunction with JavaScript error capture. However you will need both line and column numbers. This can be difficult with a simple window.onerror handler as that does not provide the column information.
There are various libraries that will wrap native functions with try/catches that could provide the column from error.stack. Use at your own risk (not sure how I feel about them)
In my case (enterprise) we have mostly IE8 users at the moment, during window.onerror it is possible to either A. Walk to callee and build a stack or B. Use window.error.errorcharacter to capture the column number. This is what I am going to be doing for the time being.
Tested with
Source Map Version 3
JavaScript source files
Source: https://github.com/RyanSylvestre/sourceMapper
Link to store: https://chrome.google.com/webstore/detail/enenhalmnhnpofkecebdmgnmmhfkhcpb